Process of making metallic cores for concrete bodies.



11. EBERLEIN. PROCESS OF MAKING METALLIC OORES FOB CONCRETE BODIES.

APPLIOATION mum AUG. 4, 1910.

982,485. Patented Jam 24, 1911.

1 UNITED stratrns PATENT orricn.

a .HEINRICI-I-EBERLEIN, or ivtmssnn, GERMANY.

, Appli cat'ion filed August 4, 18 10. Serial No. 575,477.

I To all whom it may concern:

Be it known that I, Hammer; EBERLEIN, a citizen of the Empire of Germany, residing in-Meissen, Saxony, Germany, have invented certain new and useful Improvements in Processes of Making Metallic Cores for Concrete Bodies, of which the following is a specification.

This invention relates to an improved process of making metallic frames or cores on theMonier system which are specially intended for cores in solid or tubular concrete bodies.

, The novel feature of the process consists in making a covering lattice-frame. wrapping it around a core that is made of a helically bent wire and then connecting it with said wire core. I v As compared with the process heretofore known in which a common covering" is stretched over parallel frames located at certain distances from each other, the improved process has the advantage that the helical core is much lighter and considerably cheaper.

It is also known that hollow metal frames were used for reinforcing concrete bodies which frames were made in such a manner that a helically bent wire was firmly connected with an iron lattice-work, but the improved process herein described differs from this arrangement in that the readymade covering is bentinto tubular form and wrapped around a helically-wound wire core. This arrangement is capable of economical manufacture .in large quantities as v the process of making the entire metallic frame or core has the advantage that the tedious and time-consuming interbraiding of the longitudinal and cross members of the core is dispensed with.

In the accompanying drawings, Figure 1 represents a perspective view of the helical wire core of my improved frame, Fig. 2 is a/planiew of the lattice-work covering, Fig. 3 is a horizontal t'ansverse section showing the covering lattice-work pt ed in position around the core, and Fig. t is a vertical transverse section showing the outer helical wire placed around the coveringlattice-work and connected therewith.

Similar letters of reference indicate. cor responding parts in the several figures;

According to my improved process the metal framework or core for concrete bodies is made. in the following manner: First,

Specification oi! Letters Patent.

1 ,rnocnss OF MAKING METALLIC cones For. concurs norms.

Patented Jan.

several rods a of iron or steel, the number of which corres onds to the size and circumference of tie framework to be made are arranged on a working table sidewise of each other and held in position thereon by means of sta les, pins and the like, not only as regards tiei'r (istance from each other, but also in regard to the relative position toward each other. \Vhen for instance the metalliccore for a cylindrical concrete body is to be made, the individual longitudinal rods are placed equidistantly from and )arallel with each-other; while for a conical hotly, the rods are equidistantly from each other at one end, but placed in conver in position toward each other. The longitutfina rods (1 are next connected by a plurality of parallel iron wires 1) wlnch are located closely together, and arranged preferably in pairs; 1n such a manner that an openmeshed lattice-work is'obtaincd. On a mold which-corresponds in shape with the wirereinforcing' frame to be made and the crosssection of which can be adjusted in any approved manner. is then wound an iron wire d in helical form, which is fastened at both ends to the mold. Around this wire-core is placed the lattice-work in the form of tube and tightly connected therewith by means of tying wires around the same, so that the strong longitudinal rods of the lattice-work are located in the direction of the axis of the helical core and inclose the same uniformly around its circumference. After the lattice-work a I) is thus placed in position, a helical wire-e is wound around the tubular lattice-work but in a direction opposite to that of the interior wire-core, and tied thereto by means of binding wire. The mold is then reduced in cross-section and withdrawn from the ribbed frame or core. wl -ich is then tied carefully at the intersections, -of the longitudinal and cross wires with wire, so that finally a rigidly connected metal framework and core is obtained which, when embedded in with concrete, forms therewith a structure of great strength.

In place of the lattice-work described, the covering for the interior wire-core can also be made of suitable wire netting, perforated or imperforate sheet metal, expanded sheet metal plates and the like.

Having thus described my invcnt1on,.I claim as new and desire to secure by Letters Patent:

structure,- comprising an inner helically wound wire-core of Widely spaced coils, a latticework covering Wrapped tightly aroundsaid Wire-core and consisting of a plurality' of strong longitudinal rods and a plurality of transverse wires connecting said rods, fastening wires between said wire-core and covering, a second outer helical wire-core of widely spaced coils Wound tightly around 10 the lattice-work covering, in a direction opw posite to t-liatiof the inner core and fastening wires tying said covering and cores together at their points of intersection.

In testimony, that I claim the foregoing as my invention, Ihave signed my name in presence of tw'osubscribing witnesses. 

